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290 lines
11 KiB
EmacsLisp
290 lines
11 KiB
EmacsLisp
;;; executable.el --- base functionality for executable interpreter scripts -*- byte-compile-dynamic: t -*-
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;; Copyright (C) 1994, 1995, 1996, 2000 by Free Software Foundation, Inc.
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;; Author: Daniel Pfeiffer <occitan@esperanto.org>
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;; Keywords: languages, unix
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; executable.el is used by certain major modes to insert a suitable
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;; #! line at the beginning of the file, if the file does not already
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;; have one.
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;; Unless it has a magic number, a Unix file with executable mode is passed to
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;; a new instance of the running shell (or to a Bourne shell if a csh is
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;; running and the file starts with `:'). Only a shell can start such a file,
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;; exec() cannot, which is why it is important to have a magic number in every
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;; executable script. Such a magic number is made up by the characters `#!'
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;; the filename of an interpreter (in COFF, ELF or somesuch format) and one
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;; optional argument.
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;; This library is for certain major modes like sh-, awk-, perl-, tcl- or
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;; makefile-mode to insert or update a suitable #! line at the beginning of
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;; the file, if the file does not already have one and the file is not a
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;; default file of that interpreter (like .profile or makefile). It also
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;; makes the file executable if it wasn't, as soon as it's saved.
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;; It also allows debugging scripts, with an adaptation of compile, as far
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;; as interpreters give out meaningful error messages.
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;; Modes that use this should nconc `executable-map' to the end of their own
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;; keymap and `executable-font-lock-keywords' to the end of their own font
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;; lock keywords. Their mode-setting commands should call
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;; `executable-set-magic'.
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;;; Code:
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(defgroup executable nil
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"Base functionality for executable interpreter scripts"
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:group 'processes)
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;; This used to default to `other', but that doesn't seem to have any
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;; significance. fx 2000-02-11.
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(defcustom executable-insert t ; 'other
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"*Non-nil means offer to add a magic number to a file.
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This takes effect when you switch to certain major modes,
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including Shell-script mode (`sh-mode').
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When you type \\[executable-set-magic], it always offers to add or
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update the magic number."
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;;; :type '(choice (const :tag "off" nil)
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;;; (const :tag "on" t)
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;;; symbol)
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:type 'boolean
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:group 'executable)
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(defcustom executable-query 'function
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"*If non-nil, ask user before changing an existing magic number.
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When this is `function', only ask when called non-interactively."
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:type '(choice (const :tag "Don't Ask" nil)
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(const :tag "Ask when non-interactive" function)
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(other :tag "Ask" t))
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:group 'executable)
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(defcustom executable-magicless-file-regexp "/[Mm]akefile$\\|/\\.\\(z?profile\\|bash_profile\\|z?login\\|bash_login\\|z?logout\\|bash_logout\\|.+shrc\\|esrc\\|rcrc\\|[kz]shenv\\)$"
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"*On files with this kind of name no magic is inserted or changed."
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:type 'regexp
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:group 'executable)
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(defcustom executable-prefix "#! "
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"*Interpreter magic number prefix inserted when there was no magic number."
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:type 'string
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:group 'executable)
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(defcustom executable-chmod 73
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"*After saving, if the file is not executable, set this mode.
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This mode passed to `set-file-modes' is taken absolutely when negative, or
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relative to the files existing modes. Do nothing if this is nil.
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Typical values are 73 (+x) or -493 (rwxr-xr-x)."
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:type '(choice integer
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(const nil))
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:group 'executable)
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(defvar executable-command nil)
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(defcustom executable-self-display "tail"
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"*Command you use with argument `+2' to make text files self-display.
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Note that the like of `more' doesn't work too well under Emacs \\[shell]."
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:type 'string
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:group 'executable)
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(defvar executable-font-lock-keywords
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'(("\\`#!.*/\\([^ \t\n]+\\)" 1 font-lock-keyword-face t))
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"*Rules for highlighting executable scripts' magic number.
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This can be included in `font-lock-keywords' by modes that call `executable'.")
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(defvar executable-error-regexp-alist
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'(;; /bin/xyz: syntax error at line 14: `(' unexpected
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;; /bin/xyz[5]: syntax error at line 8 : ``' unmatched
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("^\\(.*[^[/]\\)\\(\\[[0-9]+\\]\\)?: .* error .* line \\([0-9]+\\)" 1 3)
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;; /bin/xyz[27]: ehco: not found
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("^\\(.*[^/]\\)\\[\\([0-9]+\\)\\]: .*: " 1 2)
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;; /bin/xyz: syntax error near unexpected token `)'
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;; /bin/xyz: /bin/xyz: line 2: `)'
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("^\\(.*[^/]\\): [^0-9\n]+\n\\1: \\1: line \\([0-9]+\\):" 1 2)
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;; /usr/bin/awk: syntax error at line 5 of file /bin/xyz
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(" error .* line \\([0-9]+\\) of file \\(.+\\)$" 2 1)
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;; /usr/bin/awk: calling undefined function toto
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;; input record number 3, file awktestdata
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;; source line 4 of file /bin/xyz
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("^[^ ].+\n\\( .+\n\\)* line \\([0-9]+\\) of file \\(.+\\)$" 3 2)
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;; makefile:1: *** target pattern contains no `%'. Stop.
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("^\\(.+\\):\\([0-9]+\\): " 1 2))
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"Alist of regexps used to match script errors.
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See `compilation-error-regexp-alist'.")
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;; The C function openp slightly modified would do the trick fine
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(defvaralias 'executable-binary-suffixes 'exec-suffixes)
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;;;###autoload
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(defun executable-find (command)
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"Search for COMMAND in `exec-path' and return the absolute file name.
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Return nil if COMMAND is not found anywhere in `exec-path'."
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(let ((list exec-path)
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file)
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(while list
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(setq list
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(if (and (setq file (expand-file-name command (car list)))
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(let ((suffixes exec-suffixes)
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candidate)
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(while suffixes
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(setq candidate (concat file (car suffixes)))
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(if (and (file-executable-p candidate)
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(not (file-directory-p candidate)))
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(setq suffixes nil)
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(setq suffixes (cdr suffixes))
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(setq candidate nil)))
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(setq file candidate)))
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nil
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(setq file nil)
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(cdr list))))
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file))
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(defun executable-chmod ()
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"This gets called after saving a file to assure that it be executable.
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You can set the absolute or relative mode in variable `executable-chmod' for
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non-executable files."
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(and executable-chmod
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buffer-file-name
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(or (file-executable-p buffer-file-name)
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(set-file-modes buffer-file-name
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(if (< executable-chmod 0)
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(- executable-chmod)
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(logior executable-chmod
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(file-modes buffer-file-name)))))))
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(defun executable-interpret (command)
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"Run script with user-specified args, and collect output in a buffer.
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While script runs asynchronously, you can use the \\[next-error] command
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to find the next error."
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(interactive (list (read-string "Run script: "
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(or executable-command
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buffer-file-name))))
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(require 'compile)
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(save-some-buffers (not compilation-ask-about-save))
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(make-local-variable 'executable-command)
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(compile-internal (setq executable-command command)
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"No more errors." "Interpretation"
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;; Give it a simpler regexp to match.
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nil executable-error-regexp-alist))
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;;;###autoload
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(defun executable-set-magic (interpreter &optional argument
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no-query-flag insert-flag)
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"Set this buffer's interpreter to INTERPRETER with optional ARGUMENT.
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The variables `executable-magicless-file-regexp', `executable-prefix',
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`executable-insert', `executable-query' and `executable-chmod' control
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when and how magic numbers are inserted or replaced and scripts made
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executable."
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(interactive
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(let* ((name (read-string "Name or file name of interpreter: "))
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(arg (read-string (format "Argument for %s: " name))))
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(list name arg (eq executable-query 'function) t)))
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(setq interpreter (if (file-name-absolute-p interpreter)
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interpreter
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(or (executable-find interpreter)
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(error "Interpreter %s not recognized"
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interpreter))))
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(setq argument (concat (if (string-match "\\`/:" interpreter)
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(replace-match "" nil nil interpreter)
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interpreter)
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(and argument (string< "" argument) " ")
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argument))
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(or buffer-read-only
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(if buffer-file-name
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(string-match executable-magicless-file-regexp
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buffer-file-name))
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(not (or insert-flag executable-insert))
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(> (point-min) 1)
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(save-excursion
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(let ((point (point-marker))
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(buffer-modified-p (buffer-modified-p)))
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(goto-char (point-min))
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(add-hook 'after-save-hook 'executable-chmod nil t)
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(if (looking-at "#![ \t]*\\(.*\\)$")
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(and (goto-char (match-beginning 1))
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;; If the line ends in a space,
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;; don't offer to change it.
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(not (= (char-after (1- (match-end 1))) ?\ ))
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(not (string= argument
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(buffer-substring (point) (match-end 1))))
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(if (or (not executable-query) no-query-flag
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(save-window-excursion
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;; Make buffer visible before question.
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(switch-to-buffer (current-buffer))
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(y-or-n-p (concat "Replace magic number by `"
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executable-prefix argument "'? "))))
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(progn
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(replace-match argument t t nil 1)
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(message "Magic number changed to `%s'"
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(concat executable-prefix argument)))))
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(insert executable-prefix argument ?\n)
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(message "Magic number changed to `%s'"
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(concat executable-prefix argument)))
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;;; (or insert-flag
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;;; (eq executable-insert t)
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;;; (set-buffer-modified-p buffer-modified-p))
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)))
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interpreter)
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;;;###autoload
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(defun executable-self-display ()
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"Turn a text file into a self-displaying Un*x command.
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The magic number of such a command displays all lines but itself."
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(interactive)
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(if (eq this-command 'executable-self-display)
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(setq this-command 'executable-set-magic))
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(executable-set-magic executable-self-display "+2"))
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;;;###autoload
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(defun executable-make-buffer-file-executable-if-script-p ()
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"Make file executable according to umask if not already executable.
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If file already has any execute bits set at all, do not change existing
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file modes."
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(and (>= (buffer-size) 2)
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(save-restriction
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(widen)
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(string= "#!" (buffer-substring 1 3)))
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(let* ((current-mode (file-modes (buffer-file-name)))
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(add-mode (logand ?\111 (default-file-modes))))
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(or (/= (logand ?\111 current-mode) 0)
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(zerop add-mode)
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(set-file-modes (buffer-file-name)
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(logior current-mode add-mode))))))
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(provide 'executable)
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;;; executable.el ends here
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